Lifting-jack



J. HEINEN.

LIFTING JACK. APPLICATION FILED JAN.29, 1920.

1,345, 1 78. Patented June 29, 1920,

UNITED STATES PATENT OFFICE.

JOHN. HEINEN, or ATCHISON, KANSAS.

LIFTING-J'ACK.

To all whom it may 00mm.-

Be it known that 1, JOHN HEINEN, a citizen of the United States of America, and resident of Atchison,'in the countyofAtchison and State of Kansas, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specification. v

This invention relates to hoisting devices and particularly to lifting jacks, the said invention having for its object the provision of a lifting lever and handle, the combined handle and lever being foldable so that the handle can be moved out to increase the leverage and then moved back parallel with the load engaging member of the lever, novel means-being also provided for holding the lever at different positions of adjustment.

A further object of the invention is .to provide novel means whereby the lever retaining member is held, against movement beyond a predetermined degree in one direction, the said device consisting of comparatively few parts of simple and inexpensive construction.

l/Vith the foregoing and other objects in view, the invention consists in the details of construction, and in the arrangement and combination of parts to be hereinafter more fully set forth and claimed.

In describing the invention in detail, reference will be had to the accompanying drawings forming part of this specification wherein like characters denote correspond ing parts in the several views and in which- Figure 1 is a view in elevation of the lifting jack embodying the invention;

Fig. 2 is a topplan view thereof; and

Fig. 3 is a side elevation with the parts in folded positions.

In these drawings, 5 denotes a base having said link having a lug 14 projecting from one side thereof downwardly and adapted to engage a flange 15 ofthe base 5 so that oscillatable movement of the link in one direction is limited, by reason of the fact that the Specification of Iietters Patent. Patented June 29, 1920 Application filed January 29, 1920. Serial N... 354,991.

111g. 14 will en'a q the link. 5 g an Supp t The upper: end of the link is bif and the load engaging lever 7 extends be tween the furcations of the lever, and the said member 5 is adapted to engage the link 13 at the bottom of the space between the furcatlons to force the link into position parallel with the standard, as is shown in Fig). 3.

7 he edge of the link has a series of projectlons 16 in spaced relation to each other, and these projections are adapted to engage a pm 19 according to the degree of elevation of the load engaging member, and the relation of parts is such that the base is operative to retain the jack in an upright posiof the handle will result in the manipulation of the load engaging member to lift the load and when lifted, the link will adjust itself by gravity and swing outwardly into engagement with the pin; The upper surfaces of the projecting members are inclined so that they form camming surfaces which will tend to move the link rearwardly when pressure is applied in the act of lifting the load, and thus the pin 19 can move with relation to the projections from one to the other downwardly and the link will automatically engage the pin to hold the parts. in the different positions of adjustment, ow-

ing to the fact'that it will swing outwardly at the top by gravity.

1. In a lifting jack, a base having a standard, a load supporting member pivotally connected to the standard, a pin extending transversely of the load engaging member, a link pivotally connected to the standard and having means for engaging the pin, a lug at the lower end of the link engaging the base for holding the link against movement in one direction, andmeans for exerting pressure on the load engaging member.

2. Ina lifting ack, a base having a standard, a flange on the base, a link pivotally connected to the base, a lug extending from the link and adapted to engage the flange for limiting the movement of the link, a load engaging member pivotally connected to the standard, a device on the said load engaging member engageable for holding the load engaging member at predetermined po- I sitions, and a lever pivotally connected to the said load engaging member.

3. In alifting jack, afbase, a standard rising therefrom, a load engaging member pivotally connected tothestandard, a link pivotally Connected to the base,-

link 1'? having a bifurcated upper end to receive the load engaging member and adapted to be engaged by the load engaging member for holding the link parallel With the standard, projections on the link, a pin on the load engaging member adapted tobe engaged'by the projections for holdingthe load engaging member at different positions of adjustment, and a lever pivotally connected to the said load engagingmember.

JOHN HEINEN. '7

7 Witness: JOHN -N. 'ERNGEN. 

